1,720,976 research outputs found

    Studio di sistemi di conservazione per il prolungamento della shellf-life di finocchi freschi.

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    Questa ricerca ha riguardato lo studio del prolungamento della shelf-life dei finocchi mediante la refrigerazione e l'impiego di imballaggi attivi. Inoltre, poiché i processi di imbrunimento enzimatico ne limitano mediamente la conservabilità a soli 2-7 giorni, é stata valutata la possibilità di impiego di inibitori dell'attività polifenolossidasica per rallentare le alterazioni a carico delle superfici sottoposte a stress traumatici. Lo studio é stato effettuato sia confezionando il prodotto mediante adsorbenti addizionati con etanolo, sia confezionando i finocchi senza adsorbenti, ma pretrattandone il torsolo con una soluzione acquosa allo 0,01% di una sostanza ad azione antiossidasica, antiossidante ed antimicrobica, nonché inibente della produzione di etilene. Le prove condotte hanno consentito di prolungare la shelf-life dei finocchi fino a 14 giorn

    A new procedure for data reduction in electrophoretic fingerprints of whole-cell proteins

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    A procedure for the treatment of electrophoretic patterns is presented and discussed using SDS-PAGE patterns of whole-cell proteins of lactic acid bacteria as an example. Complex patterns consisting of two vectors of data [molecular weights (MW), and band intensities] with varying length were transformed in a single vector of fixed length consisting of band intensities accumulated in classes of MW by a logistic weighting function. The procedure performed better than a commercial software (Diversity Database) in clustering the patterns

    Phenotypic and genotypic diversity of yeasts isolated from water-buffalo Mozzarella cheese

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    Water-buffalo Mozzarella (WBM) cheese is one of the several 'pasta filata' or stretched curd cheeses that originated in southern Italy, traditionally manufactured from raw milk employing natural whey starter cultures. Lactose- and galactose-fermenting yeasts isolated from WBM were studied to evaluate their role in the ripening of this cheese. The kinetic parameters of the growth of the yeasts as well as their principal metabolic end-products showed a great variability depending on the species. Moreover, the genetic polymorphism of the yeasts was studied for their differentiation at species level by means of the polymerase chain reaction (PCR) fingerprinting and mitochondrial DNA (mtDNA) restriction analysis. While the differentiation based on metabolic traits was not able to discriminate Kluyveromyces marxianus, Candida kefyr and C. sphaerica, the PCR analysis with primers M13 and RF2 resulted in a reliable and rapid method for differentiating at species level Saccharomyces cerevisiae, K. marxianus, K. lactis and their anamorphic species. Furthermore, mtDNA analysis proved to be more discriminating at strain level
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